3 definitions
by
psush_girl

Most likely originated around the time of Hanson's "Mmmbop"; an ear worm refers to any song that is so catchy, and at the same time extremely annoying, that it feels like a worm has crawled into your ear and eaten the intelligent parts of your brain so that you hum the song all day long, no matter how much you hate it.

Most recently used at Penn State University where it is used to describe a hardcore devouring of a substance (usually food); can also be used (less frequently) to describe how skilled one is at a particular task.